Claret-red trisazo dyestuff.



err air FELIX KLINGEMANN, 0F IEAINKUR, NEAR FRANKFORT-ON-THE-MAIN, GERMANY, ASSIGNOR T0 CASSELLA COLOR COMPANY, A CORPORATION QF NEW YORK.

CLARET-RED TBISAZO DYESTUFF.

No Drawing.

To all whom it may concern: I

Be it known that I, FELIX KLINGEMANN,

N=N-2.5.7-aminonaphtho1sulfonic acid with two molecules of resorcin.

The new dyestufi' dyes very fine claret red shades and possesses the valuable property 38 kilos of the sodium salt of m-amino'- phenylazo 2.5.7 aminonaphtholsulfonic acid, are tetrazotized with 70 kilos hydrochloric acid, and

14 kilos nitrite of soda.

The tetrazo compound is allowed to flow into a solution of 22.5 kilos resorcin, to which an excess of soda has been added. The d'yestufi is separated from the Warm solution by common salt, filtered and dried. The dyestuff is a dark powder soluble in Specification of Letters Patent.

Patented Aug. 1?, 19150 Application filed October 8, 1914. Serial 310.865,?68.

concentrated sulfuric acid with a blue color. It corresponds to the formula 80 which is after being dried and pulverized in the shape of its alkaline salt a dark red powder soluble in hot water with a claretred coloration, being soluble in concentrated sulfuric acid with a blue color, yielding upon treatment with stannous chlorid and hydrochloric acid meta-phenylenediamin, 2.6 diamino 5 hydroxynaphthalene-7-su1- fonic acid and'1-amino-QA-dihydroxy-benzene, dyeing cotton in fine claret-red Shades which are fast to washing after being ms sas treated with formaldehyde, substantially as 10 described.

In witness whereof I have hereunto signed my name this 17th day of Sept. 1914:, in the presence of two subscribing witnesses.

FELIX KLINGEMANN.

Witnesses:

JEAN GRUND, CARL GRUND. 

